Step 1: The first step is to open Google Classroom and click Classwork

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Step 2: Click Create

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Step 3: Click Topic

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Step 4: Type the title of your resource topic (section) in Topic

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Step 5: Click Add

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Step 6: Click Create

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Step 7: Click Material

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Step 8: Type the title of your resource in Title

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Step 9: Click Attach Google Drive item or other media type and follow through those steps to add the resource

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Step 10: Click arrow next to Topic

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Step 11: Click appropriate option

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Step 12: Click Save options

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Step 13: Click your choice

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Step 14: Click Post

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Step 15: That's it. You're done.

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Here's an interactive tutorial for the visual learners

https://www.iorad.com/player/143486/Google-Classroom--Adding-Resource-Section